Many of us have difficulty in getting a good night's sleep, whether it is down to stress, staring at our smartphones before bed or an over-reliance on caffeine. For some, the problem is more long-term - thousands of people suffer from rare sleep d...

I was 18 or 19 years old, sitting around and yakking with some friends, when someone said they hadn't slept soundly the previous night. She just couldn't get sleep for hours after turning in, she said, sounding like this was very much a new thing ...